Influence of phosphorus and nitrogen on photosynthetic parameters and growth in Vicia faba L.

Abstract

The influence of phosphorus (P) and nitrogen (N) supply on biomass, leaf area, photon saturated photosynthetic rate (P max ), quantum yield efficiency (α), intercellular CO 2 concentration (C i ), and carboxylation efficiency (CE) was investigated in Vicia faba. The influence of P on N accumulation, biomass, and leaf area production was also investigated. An increase in P supply was consistently associated with an increase in N accumulation and N productivity in terms of biomass and leaf area production. Furthermore, P increased the photosynthetic N use efficiency (NUE) in terms of P max and α. An increase in P supply was also associated with an increase in CE and a decrease in C i. Under variable daily meteorological conditions specific leaf nitrogen content (N L ), specific leaf phosphorus content (P L ), specific leaf area (δ L ), root mass fraction (R f ), P max , and α remained constant for a given N and P supply. A monotonic decline in the steady-state value of R f occurred with increasing N supply. δ L increased with increasing N supply or with increasing N L . We tested also the hypothesis that P supply positively affects both N demand and photosynthetic NUE by influencing the upper limit of the asymptotic values for P max and CE, and the lower limit for C i in response to increasing N.Additional key words: carboxylation efficiency; intercellular CO 2 concentration; leaf area; nitrogen use efficiency; photon saturated photosynthetic rate; quantum yield efficiency; root; stem.

Response of Potato Gas Exchange and Productivity to Phosphorus Deficiency and Carbon Dioxide Enrichment

“…2). Similar reductions have been observed in P‐deficient tea (Salehi and Hajiboland, 2008), sugar beets (Rao et al, 1990), common bean (Nielsen et al, 2001), faba bean ( Vicia faba L.) (Jia and Gray, 2004, 2007), and maize leaves (Khamis et al, 1990). Effects of P deficiency on leaf photosynthetic capacity at saturating irradiance were also observed on the A‐Ci responses (Fig.…”

“…This purported control over rate limiting steps is consistent with the reduction in J max with P treatment in Table 2. Although Rao and Terry (1989) did not measure a reduction in its activity, Brooks (1986) and Brooks et al (1988) observed reduced RuBisCo carboxylase content in P-defi cient leaves and Jia and Gray (2004) observed a decrease in V cmax with declining P supply in faba bean, reasoning that P supply infl uenced the rate of RuBisCo carboxylase activation, a phenomena likely related to the present observations. In the present case, leaf N concentration did not decline with soil P (Fig.…”

“…Presumably such declines were the result of reduced leaf and canopy net assimilation rate in addition to morphological and C partitioning responses; however, to the best of our knowledge, no studies on potato gas exchange in response to P fertilization have been published. Leaf photosynthetic response has been observed to decrease in response to low versus high P fertilization for other crops including bean ( Phaseolus vulgaris L.) (Nielsen et al, 2001Jia and Gray, 2004, 2007), cassava ( Manihot esculenta Crantz) (Pellet and ElSharkawy, 2003), cotton ( Gossypium hirsutum L.) (Ackerson, 1985), maize ( Zea mays L.) (Khamis et al, 1990), spinach ( Spinacia oleracea L.) (Brooks et al, 1988), sugar beet ( Beta vulgaris L.) (Abadia et al, 1987; Rao et al, 1990), and tea [ Camellia sinensis (L.) Kuntze] (Salehi and Hajiboland, 2008), a response usually attributed to an effect of limited cellular P supply on enzymatic regulation at several stages in the Calvin cycle that reduces ribulose bisphosphate regeneration rate that are linked to adenosine triphosphate (ATP) production. Ribulose 1,5‐bisphosphate carboxylase oxygenase (RuBisCo) concentration may increase in leaves of some P‐deficient plants in which leaf N increases as a result of reduced leaf expansion, although most of these same reports indicate overall RuBisCo activity is reduced when P is limiting.…”

Photosynthetic traits of tree species in response to leaf nutrient content in the central Amazon

“…Phosphorus deficiency decreases photosynthetic electron transport capacity by impairing the electron transport chain. Such impairment decreases ATP content, which in turn limits RuBP regeneration and therefore the rate of CO 2 assimilation (Jia and Gray 2004;Lin et al 2009). This may explain the positive relationship between V c-max and P. In addition, the supply of inorganic P regulates the Calvin cycle and the transport of metabolic and assimilated compounds.…”

“…In addition to its catalytic role, it has been suggested that under high availability of nitrogen, Rubisco can function as a storage protein (Warren et al 2003;Warren 2004). Although several studies have been conducted on the effect of nutrient on photosynthesis (Jia and Gray 2004;Hidaka and Kitayama 2009), specific information about the in situ nutrient-photosynthesis relationship of Amazonian trees is still sparse (Mendes et al 2013). In this study, we hypothesized that under the ambient conditions of the forest understory, photosynthesis, V c-max and J max may be limited by the availability of nutrients and that species with low leaf nutrient content are able to use them parsimoniously.…”